Handle-lock for pneumatic tools.



G'. L. BROWN. HANDLE LOCK lrola PNEUMATIG-TooLs. APPLIOTION- FILED.00T.,2, '1907.

. Patented Mar.23, 1909.

V' Ci l I l I Jz/nesse.- y

'QQEMW l y ,@fw-

"ononenjrn BROWN,v or Lottisviiirn, KENTUCKY, AssIeNoa To STANDARDRAILWAY EoUirMEN'r oo MPANY, EAST sT'. lLouis, ILLiNois, A CORPORATIONor ILLI- ANoisrl l nennen-Loon non miarroroots.

in. mensa? the city,T oi Louisville, county oi Jeiierson',

State of Kentucky, have invented a Handle' Lock for Pneumatic Tools, ofwhich the iollowing is a specification.

iev.

SI the common type'of pneumatic hammers, the cylinderl or barrel has ascrewthreadcd 'connection with theliandle portion; and, howevertightthis connection may he: originally, the continual jarring oi thetoolin'practical-use is liable to, affect the threadsl so este producefa loosene'ss even when the parte are securely locked against rotation.l h f The principal object of my invention is to preventsuch lo'oseness.y

.The invention consistsdn the construction 'hereinafter described andclaimed. 'f 1-In thefaccompanying drawings, which form part of this.specification, and. 'wherein like symbols refer to like parte wherever f@Ourthe of a s ecial tool for disengaging the cou ling f A illutifatedber?) is a strong piece of resilient stee whose.,

thy'occur, Figure 1 is a side view oi aneuinatic riveting hammerecfluippcd'wit my coupling device; Fig, 2 is a ragmentary View a'rtly4inelevation and partly in section; ig..-3 is a .detai1l pers ectiveview4 or" the '.uember; and, ig. 4 is a detail .viewv terloclrey. l

n Vp:eefumatic hammers of the ty e illustrated inthedrawing, .therear'en 'of the mem er from the member with Whichit inbarrel bis reducedin diameter ,and screwthreaded so as .to ht inthe screw-threadedsocketothe handle ortion 2: By arrangement, auann har shoulder ,isformed on the barrel opposite the end of the socket portionof lthehandle.' v According to my invention", the vlocking member 3 adaptedfor,- engagement fboth with` said shoulder and withfthe en d of saidsocket portion is interposed between them.

Fig. v3, the lookin memhody portion is of helical form with an in-''ternal diameterv suiiicient to .let it passt'oyer -thereduced end ofthe barrel.

y A Une, end of this helicall piece is bent transversely I to 'thetoothjfformed thereon. -'lhiehent end off-the hiking-mem?) .ff-atherefoer yits in a; mortise provided theendo the Wall oi the'handle PatentedMarch 23, 1909.

ermanently secured to said handle portion. '`l"1e ratohet.tooth at thelother end of said l locking' member is adapted to cooperate with ratchetteeth 6 provided thereior on the shoulder of the barrelf.

in practice, the helical member is firmly' secured to the end of thesocket member, the valve block and valve are positioned in the socket,and then the threaded reduced end 'of the barrel is inserted into ,thethreaded portion of said socket `and turned therein. During theturningofthe barrel, the ratchet tooth 'on the end of the locking member ridesover the ratchet teeth on the shoulder in the usual manner, and thehelical spring is com- 'pressedtransversely Eventuali the end oi thebarrel jams the valve b ook firmly against the bottom oi the socket,whereupon the several members act as a solid piece. In this osition, thetooth of the resilient 4locking evice automatically engages one of theteeth on the shoulder. oi the barrel and thus automatically locks thebarrel against occasioned by a change' in the threads rcsultf ing fromcontinuous jarring, -In order to guard against such looseness, thelocking device is expanded peripherally until `its ratchet tooth ridesover one or moreof the 'cooperating ratchet teeth on` the barrel.4

The engagement of the ratchet tooth of the lookin device thus expandedbeynnditsf.l

norma diameter maintains a continuous Eeripheral pressure tending to@ern the arrel relative to the handle in the'proper direction to take upany looseness that may occur during the use of the tool. The qeripheralexpansion of the locking metri erl may vhe conveniently' effected bymeans of an ordinary Spanner-wrench.

from the barrel, the toolillustrated n Fig. 4 isV especiallylconvenient, as it can e easily applied to t e tool and disengagedtherefrom. .This toolcompr'ises a yoke 7, one end 8 of In order to disengage the helicl spring which -is shaped to enter' the trisingularspace between the helical member 'randzthe beveled surface of a tooth onthe shoulder of they ,l'iarrel.

The other-end'o the yoke has le screw-threaded hole therein throughwhich.;

extends a threaded bolt ,9. ln practice, the;

roby said' locking me'mloer.,v is

triangularend of theyole inserted .under licalsprng en [the othereiid-ofthe yoke is placed over the rear end of the socket portion of the handlewith the bolt in alinement therewith. The bolt is then screwed inwardlywith the result that, as the-inner end of the bolt bears against a fixedabutment, the power applied thereto is transferred directly to thehelical member and drawsor pulls it backwardly away from the shoulder ofthe barrel. The tool will hold the helical spring thus disengaged aslong, as desired, and thus the operation of screwing and-,unscrewinorthe parts together are simplified and facilitated.

Obviously, the construction hereinbeorc described admits ofconsiderablel variation without departing from my invention. Forinstance, the ratchet tooth may be formed on the end of the handleportion instead of on the barrel, in which case the .locking membercould be permanently fixed to the So, too, the locking member may theratchet teeth may be formed on 'the peripheral face of one o the membersto be secured.

l'Vhat I claim is:

1. In a pneumatic tool, the combination with a handle member having athreaded socketv therein and a barrel member having areduced end portionthreaded to enter said socket, of a resilient helical locking memberinterposed between said members, l the shoulder of said barrel memberhaving l 'teeth formed thereon and said locking memberbeing fixed at oncend to said handlej member and being peripherally expanded l beyond itsnormal diameter n ,l other end adapted to co erate with said teeth thebody portion of t ie locking menu l ber being clear of the handlemember.

2. In a pneumatic tool, a handle piece having a socket, a barrel havinga reduced end portion engaging said socket and ratchet l teeth on theshoulder formed by said re-- l duced end, and a helical member having xone end fixed to said handle and having its bother end adapted tointerlock with said teeth said helical member being narrower than `thedistance between the handle `mem ber and-said shoulder and beingresilient peri )herally 'and transversely and being expan( ed beyond.its normal diameter.

3. The combination with the handle'member and the barrel member of apneumatic tool of a resilient curved locking member i interposed betweenand adapted to engage l said members, and a yoke having one end iadapted to secure a purchase on the forward l face of said lockingmember and whoseother end comprises a movable part adapted to secure apurchase on the rear portlon of the handle.

i name to this specification in the presence of i two subscribingwitnesses this 28th day of September, 1907, at St. Louis, Missouri.

GEORGE L. BRQXVN. Witnesses z A. A. Porrs, G. A. PENNiNoToN.

In testimony whereof I have signed my and having its

